Hinting at an early budget session, Parliamentary Affairs Minister M. Venkaiah Naidu on Thursday met Congress president Sonia Gandhi seeking cooperation on the GST Bill."Met Sonia Gandhi and Manmohan Singh over Goods and Services Tax (GST) issue. They had raised some issues which have been addressed by Finance Minister Arun Jaitley," Naidu told the media after the meeting.Bharatiya Janata Party (BJP) sources said the leaders discussed the GST Bill and Real Estate Bill.Naidu also said the government was willing to call for an early budget session if required.